9-3x=2x-21

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Solution for 9-3x=2x-21 equation: 



9-3x=2x-21

We move all terms to the left:

9-3x-(2x-21)=0

We get rid of parentheses

-3x-2x+21+9=0

We add all the numbers together, and all the variables

-5x+30=0

We move all terms containing x to the left, all other terms to the right

-5x=-30

x=-30/-5

x=+6

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